import 'package:flutter/material.dart';

import '../../res/xmm_colors.dart';

TabBar defTabBar(
  List<Widget> tabs, {
  bool isShowIndicator = false,
  TabController? tabController,
  double selectedFontSize = 20,
  double unselectedFontSize = 16,
  ScrollPhysics? physics,
}) {
  Decoration indicator;
  if (isShowIndicator) {
    indicator = const UnderlineTabIndicator(
        borderRadius: BorderRadius.all(Radius.circular(5)),
        borderSide: BorderSide(width: 2.0, color: XmmColorsUtils.themeColor),
        insets: EdgeInsets.only(bottom: 10));
  } else {
    indicator = const BoxDecoration();
  }
  return TabBar(
    physics: physics,
    padding: const EdgeInsets.only(left: 6, top: 0, bottom: 0),
    labelPadding: const EdgeInsets.symmetric(horizontal: 7),
    isScrollable: true,
    labelColor: XmmColorsUtils.tabBarUnselectColor,
    unselectedLabelColor: XmmColorsUtils.tabBarUnselectColor,
    labelStyle: TextStyle(
        fontSize: selectedFontSize,
        color: XmmColorsUtils.tabBarUnselectColor,
        fontWeight: FontWeight.bold),
    unselectedLabelStyle: TextStyle(
        fontSize: unselectedFontSize,
        color: XmmColorsUtils.tabBarUnselectColor,
        fontWeight: FontWeight.normal),
    indicatorWeight: 3.0,
    indicatorSize: TabBarIndicatorSize.label,
    indicator: indicator,
    tabs: tabs,
    controller: tabController,
  );
}

class UnderlineTabIndicator extends Decoration {
  /// Create an underline style selected tab indicator.
  ///
  /// The [borderSide] and [insets] arguments must not be null.
  const UnderlineTabIndicator({
    this.borderRadius,
    this.borderSide = const BorderSide(width: 2.0, color: Colors.white),
    this.insets = EdgeInsets.zero,
  });

  /// The radius of the indicator's corners.
  ///
  /// If this value is non-null, rounded rectangular tab indicator is
  /// drawn, otherwise rectangular tab indictor is drawn.
  final BorderRadius? borderRadius;

  /// The color and weight of the horizontal line drawn below the selected tab.
  final BorderSide borderSide;

  /// Locates the selected tab's underline relative to the tab's boundary.
  ///
  /// The [TabBar.indicatorSize] property can be used to define the tab
  /// indicator's bounds in terms of its (centered) tab widget with
  /// [TabBarIndicatorSize.label], or the entire tab with
  /// [TabBarIndicatorSize.tab].
  final EdgeInsetsGeometry insets;

  @override
  Decoration? lerpFrom(Decoration? a, double t) {
    if (a is UnderlineTabIndicator) {
      return UnderlineTabIndicator(
        borderSide: BorderSide.lerp(a.borderSide, borderSide, t),
        insets: EdgeInsetsGeometry.lerp(a.insets, insets, t)!,
      );
    }
    return super.lerpFrom(a, t);
  }

  @override
  Decoration? lerpTo(Decoration? b, double t) {
    if (b is UnderlineTabIndicator) {
      return UnderlineTabIndicator(
        borderSide: BorderSide.lerp(borderSide, b.borderSide, t),
        insets: EdgeInsetsGeometry.lerp(insets, b.insets, t)!,
      );
    }
    return super.lerpTo(b, t);
  }

  @override
  BoxPainter createBoxPainter([VoidCallback? onChanged]) {
    return _UnderlinePainter(this, borderRadius, onChanged);
  }

  Rect _indicatorRectFor(Rect rect, TextDirection textDirection) {
    double width = 11;
    final Rect indicator = insets.resolve(textDirection).deflateRect(rect);
    return Rect.fromLTWH(
      indicator.left + indicator.width / 2 - width / 2,
      indicator.bottom - borderSide.width,
      width,
      borderSide.width,
    );
  }

  @override
  Path getClipPath(Rect rect, TextDirection textDirection) {
    if (borderRadius != null) {
      return Path()
        ..addRRect(
            borderRadius!.toRRect(_indicatorRectFor(rect, textDirection)));
    }
    return Path()..addRect(_indicatorRectFor(rect, textDirection));
  }
}

class _UnderlinePainter extends BoxPainter {
  _UnderlinePainter(
    this.decoration,
    this.borderRadius,
    super.onChanged,
  );

  final UnderlineTabIndicator decoration;
  final BorderRadius? borderRadius;

  @override
  void paint(Canvas canvas, Offset offset, ImageConfiguration configuration) {
    assert(configuration.size != null);
    final Rect rect = offset & configuration.size!;
    final TextDirection textDirection = configuration.textDirection!;
    final Paint paint;
    if (borderRadius != null) {
      paint = Paint()..color = decoration.borderSide.color;
      final Rect indicator = decoration
          ._indicatorRectFor(rect, textDirection)
          .inflate(decoration.borderSide.width / 4.0);
      final RRect rrect = RRect.fromRectAndCorners(
        indicator,
        topLeft: borderRadius!.topLeft,
        topRight: borderRadius!.topRight,
        bottomRight: borderRadius!.bottomRight,
        bottomLeft: borderRadius!.bottomLeft,
      );
      canvas.drawRRect(rrect, paint);
    } else {
      paint = decoration.borderSide.toPaint()..strokeCap = StrokeCap.square;
      final Rect indicator = decoration
          ._indicatorRectFor(rect, textDirection)
          .deflate(decoration.borderSide.width / 2.0);
      canvas.drawLine(indicator.bottomLeft, indicator.bottomRight, paint);
    }
  }
}
